Had a mechanic friend tell me about them and was wondering if anyone here has any experience with them. He put one in his buddies truck and said he got great results, only problem was when he accelerated the check engine light would come on and then go off.

Thoughts??

Just wondering

I've got a 2009 F350 4x4 4 door long bed 6.4 Powerstroke

 

all it is is a resister that fools the computer into thinking it is 50 below air intake temp to make the engine run rich.
total waste of money.
buy a real tuner from a known reputable company like dp tuners or tony wildman.

 

Thanks for the insight.